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Q: Service Emissions System light is on

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My Service Emissions System light is on.

A: The most common cause of the service emissi...

The most common cause of the service emissions light coming on is an EVAP (gas vapor) leak. The first place to look for an EVAP leak is the gas cap - especially if you have just gotten fuel. A qualified technician, like one from YourMechanic, will be able to inspect your Service Emission System light and repair any issues you may be having with your car.

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